Compress all translated strings with Huffman coding.

This saves code space in builds which use link-time optimization.
The optimization drops the untranslated strings and replaces them
with a compressed_string_t struct. It can then be decompressed to
a c string.

Builds without LTO work as well but include both untranslated
strings and compressed strings.

This work could be expanded to include QSTRs and loaded strings if
a compress method is added to C. Its tracked in #531.

1 files changed, 2 insertions, 2 deletions

diff --git a/py/compile.c b/py/compile.c
index c4f447c56..1218aa07e 100644
--- a/py/compile.c
+++ b/py/compile.c
@@ -156,7 +156,7 @@ STATIC void compile_error_set_line(compiler_t *comp, mp_parse_node_t pn) {
     }
 }
 
-STATIC void compile_syntax_error(compiler_t *comp, mp_parse_node_t pn, const char *msg) {
+STATIC void compile_syntax_error(compiler_t *comp, mp_parse_node_t pn, const compressed_string_t *msg) {
     // only register the error if there has been no other error
     if (comp->compile_error == MP_OBJ_NULL) {
         comp->compile_error = mp_obj_new_exception_msg(&mp_type_SyntaxError, msg);
@@ -949,7 +949,7 @@ STATIC void compile_del_stmt(compiler_t *comp, mp_parse_node_struct_t *pns) {
 
 STATIC void compile_break_cont_stmt(compiler_t *comp, mp_parse_node_struct_t *pns) {
     uint16_t label;
-    const char *error_msg;
+    const compressed_string_t *error_msg;
     if (MP_PARSE_NODE_STRUCT_KIND(pns) == PN_break_stmt) {
         label = comp->break_label;
         error_msg = translate("'break' outside loop");